/
basic.py
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/
basic.py
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import numpy
import cupy
from cupy._core.internal import _get_strides_for_order_K, _update_order_char
def empty(shape, dtype=float, order='C'):
"""Returns an array without initializing the elements.
Args:
shape (int or tuple of ints): Dimensionalities of the array.
dtype: Data type specifier.
order ({'C', 'F'}): Row-major (C-style) or column-major
(Fortran-style) order.
Returns:
cupy.ndarray: A new array with elements not initialized.
.. seealso:: :func:`numpy.empty`
"""
return cupy.ndarray(shape, dtype, order=order)
def _new_like_order_and_strides(
a, dtype, order, shape=None, *, get_memptr=True):
"""
Determine order and strides as in NumPy's PyArray_NewLikeArray.
(see: numpy/core/src/multiarray/ctors.c)
"""
order = order.upper()
if order not in ['C', 'F', 'K', 'A']:
raise ValueError('order not understood: {}'.format(order))
if numpy.isscalar(shape):
shape = (shape,)
# Fallback to c_contiguous if keep order and number of dimensions
# of new shape mismatch
if order == 'K' and shape is not None and len(shape) != a.ndim:
return 'C', None, None
order = chr(_update_order_char(
a.flags.c_contiguous, a.flags.f_contiguous, ord(order)))
if order == 'K':
strides = _get_strides_for_order_K(a, numpy.dtype(dtype), shape)
order = 'C'
memptr = cupy.empty(a.size, dtype=dtype).data if get_memptr else None
return order, strides, memptr
else:
return order, None, None
def empty_like(a, dtype=None, order='K', subok=None, shape=None):
"""Returns a new array with same shape and dtype of a given array.
This function currently does not support ``subok`` option.
Args:
a (cupy.ndarray): Base array.
dtype: Data type specifier. The data type of ``a`` is used by default.
order ({'C', 'F', 'A', or 'K'}): Overrides the memory layout of the
result. ``'C'`` means C-order, ``'F'`` means F-order, ``'A'`` means
``'F'`` if ``a`` is Fortran contiguous, ``'C'`` otherwise.
``'K'`` means match the layout of ``a`` as closely as possible.
subok: Not supported yet, must be None.
shape (int or tuple of ints): Overrides the shape of the result. If
``order='K'`` and the number of dimensions is unchanged, will try
to keep order, otherwise, ``order='C'`` is implied.
Returns:
cupy.ndarray: A new array with same shape and dtype of ``a`` with
elements not initialized.
.. seealso:: :func:`numpy.empty_like`
"""
if subok is not None:
raise TypeError('subok is not supported yet')
if dtype is None:
dtype = a.dtype
order, strides, memptr = _new_like_order_and_strides(a, dtype, order,
shape)
shape = shape if shape else a.shape
return cupy.ndarray(shape, dtype, memptr, strides, order)
def eye(N, M=None, k=0, dtype=float, order='C'):
"""Returns a 2-D array with ones on the diagonals and zeros elsewhere.
Args:
N (int): Number of rows.
M (int): Number of columns. ``M == N`` by default.
k (int): Index of the diagonal. Zero indicates the main diagonal,
a positive index an upper diagonal, and a negative index a lower
diagonal.
dtype: Data type specifier.
order ({'C', 'F'}): Row-major (C-style) or column-major
(Fortran-style) order.
Returns:
cupy.ndarray: A 2-D array with given diagonals filled with ones and
zeros elsewhere.
.. seealso:: :func:`numpy.eye`
"""
if M is None:
M = N
ret = zeros((N, M), dtype, order=order)
ret.diagonal(k)[:] = 1
return ret
def identity(n, dtype=float):
"""Returns a 2-D identity array.
It is equivalent to ``eye(n, n, dtype)``.
Args:
n (int): Number of rows and columns.
dtype: Data type specifier.
Returns:
cupy.ndarray: A 2-D identity array.
.. seealso:: :func:`numpy.identity`
"""
return eye(n, dtype=dtype)
def ones(shape, dtype=float, order='C'):
"""Returns a new array of given shape and dtype, filled with ones.
This function currently does not support ``order`` option.
Args:
shape (int or tuple of ints): Dimensionalities of the array.
dtype: Data type specifier.
order ({'C', 'F'}): Row-major (C-style) or column-major
(Fortran-style) order.
Returns:
cupy.ndarray: An array filled with ones.
.. seealso:: :func:`numpy.ones`
"""
a = cupy.ndarray(shape, dtype, order=order)
a.fill(1)
return a
def ones_like(a, dtype=None, order='K', subok=None, shape=None):
"""Returns an array of ones with same shape and dtype as a given array.
This function currently does not support ``subok`` option.
Args:
a (cupy.ndarray): Base array.
dtype: Data type specifier. The dtype of ``a`` is used by default.
order ({'C', 'F', 'A', or 'K'}): Overrides the memory layout of the
result. ``'C'`` means C-order, ``'F'`` means F-order, ``'A'`` means
``'F'`` if ``a`` is Fortran contiguous, ``'C'`` otherwise.
``'K'`` means match the layout of ``a`` as closely as possible.
subok: Not supported yet, must be None.
shape (int or tuple of ints): Overrides the shape of the result. If
``order='K'`` and the number of dimensions is unchanged, will try
to keep order, otherwise, ``order='C'`` is implied.
Returns:
cupy.ndarray: An array filled with ones.
.. seealso:: :func:`numpy.ones_like`
"""
if subok is not None:
raise TypeError('subok is not supported yet')
if dtype is None:
dtype = a.dtype
order, strides, memptr = _new_like_order_and_strides(a, dtype, order,
shape)
shape = shape if shape else a.shape
a = cupy.ndarray(shape, dtype, memptr, strides, order)
a.fill(1)
return a
def zeros(shape, dtype=float, order='C'):
"""Returns a new array of given shape and dtype, filled with zeros.
Args:
shape (int or tuple of ints): Dimensionalities of the array.
dtype: Data type specifier.
order ({'C', 'F'}): Row-major (C-style) or column-major
(Fortran-style) order.
Returns:
cupy.ndarray: An array filled with zeros.
.. seealso:: :func:`numpy.zeros`
"""
a = cupy.ndarray(shape, dtype, order=order)
a.data.memset_async(0, a.nbytes)
return a
def zeros_like(a, dtype=None, order='K', subok=None, shape=None):
"""Returns an array of zeros with same shape and dtype as a given array.
This function currently does not support ``subok`` option.
Args:
a (cupy.ndarray): Base array.
dtype: Data type specifier. The dtype of ``a`` is used by default.
order ({'C', 'F', 'A', or 'K'}): Overrides the memory layout of the
result. ``'C'`` means C-order, ``'F'`` means F-order, ``'A'`` means
``'F'`` if ``a`` is Fortran contiguous, ``'C'`` otherwise.
``'K'`` means match the layout of ``a`` as closely as possible.
subok: Not supported yet, must be None.
shape (int or tuple of ints): Overrides the shape of the result. If
``order='K'`` and the number of dimensions is unchanged, will try
to keep order, otherwise, ``order='C'`` is implied.
Returns:
cupy.ndarray: An array filled with zeros.
.. seealso:: :func:`numpy.zeros_like`
"""
if subok is not None:
raise TypeError('subok is not supported yet')
if dtype is None:
dtype = a.dtype
order, strides, memptr = _new_like_order_and_strides(a, dtype, order,
shape)
shape = shape if shape else a.shape
a = cupy.ndarray(shape, dtype, memptr, strides, order)
a.data.memset_async(0, a.nbytes)
return a
def full(shape, fill_value, dtype=None, order='C'):
"""Returns a new array of given shape and dtype, filled with a given value.
This function currently does not support ``order`` option.
Args:
shape (int or tuple of ints): Dimensionalities of the array.
fill_value: A scalar value to fill a new array.
dtype: Data type specifier.
order ({'C', 'F'}): Row-major (C-style) or column-major
(Fortran-style) order.
Returns:
cupy.ndarray: An array filled with ``fill_value``.
.. seealso:: :func:`numpy.full`
"""
if dtype is None:
if isinstance(fill_value, cupy.ndarray):
dtype = fill_value.dtype
else:
dtype = numpy.array(fill_value).dtype
a = cupy.ndarray(shape, dtype, order=order)
a.fill(fill_value)
return a
def full_like(a, fill_value, dtype=None, order='K', subok=None, shape=None):
"""Returns a full array with same shape and dtype as a given array.
This function currently does not support ``subok`` option.
Args:
a (cupy.ndarray): Base array.
fill_value: A scalar value to fill a new array.
dtype: Data type specifier. The dtype of ``a`` is used by default.
order ({'C', 'F', 'A', or 'K'}): Overrides the memory layout of the
result. ``'C'`` means C-order, ``'F'`` means F-order, ``'A'`` means
``'F'`` if ``a`` is Fortran contiguous, ``'C'`` otherwise.
``'K'`` means match the layout of ``a`` as closely as possible.
subok: Not supported yet, must be None.
shape (int or tuple of ints): Overrides the shape of the result. If
``order='K'`` and the number of dimensions is unchanged, will try
to keep order, otherwise, ``order='C'`` is implied.
Returns:
cupy.ndarray: An array filled with ``fill_value``.
.. seealso:: :func:`numpy.full_like`
"""
if subok is not None:
raise TypeError('subok is not supported yet')
if dtype is None:
dtype = a.dtype
order, strides, memptr = _new_like_order_and_strides(a, dtype, order,
shape)
shape = shape if shape else a.shape
a = cupy.ndarray(shape, dtype, memptr, strides, order)
a.fill(fill_value)
return a